JPH0323637Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention relates to a rotary switch.

``Prior Art'' A rotary switch is used in which a switching operation of an operating shaft causes a switching spring to reverse, thereby switching between a movable contact and first and second fixed contacts.

The structure of this type of conventionally used rotary switch is shown in Fig. 2 with a partial cutaway. A base body 11 is formed, and a switch shaft 13 and first and second fixed contacts 14 and 15 are provided to protrude from a bottom plate 12 of this insulating base body 11.

This switch shaft 13 has a movable contact 16 and a switching piece 1.
7 is rotatably mounted. The movable contact 16 is made of a conductive material and formed into a plate shape, and is rotatably inserted into and held by the switch shaft 13 through a locking hole formed at one end in the longitudinal direction. The other end of the movable contact 16 has a narrow part 1.
8 is formed, and this narrow portion 18 is located between the first and second fixed contacts 14 and 15. Further, a first locking hole 9 is formed approximately at the center of the movable contact 16.

On the movable contact 16 engaged with the switch shaft 13 on the bottom plate 12, a switching piece 17 is rotatably inserted and held through the switch shaft 13 at the engagement hole portion. A retaining ring 20 is tightened around the switch shaft 13 from above the switching piece 17, and the movable contact 16 and the switching piece 17 are rotatably attached to the switch shaft 13 without coming off from the switch shaft 13.

The switching piece 17 is formed into a substantially fan shape, and an engagement hole for the switch shaft 13 is formed at a key position of the fan.
The switching parts 21-1 and 21-1 and 21-2 are arranged so as to sandwich this engagement hole.
2-2 is formed thick. A locking portion 22 is formed between these switching portions 21-1 and 21-2, protruding in a direction opposite to the engagement hole. This locking part 2
2, a second locking hole 23 is formed.

Both ends of the switching spring 25 are locked between the first and second locking holes 9 and 23, respectively. Switching spring 25
has a shape as shown in FIG. 3, and its free end length l is set to be slightly larger than the distance between the first and second locking holes 9 and 23. This switching spring 25
, and insert one end into the first locking hole 9 from both open sides of the insulating base 11 to the bottom plate 12 so as to narrow the free end length l.
The other end is locked in the direction toward the second locking hole 2.
3 is engaged in the direction from the bottom plate 12 side of the insulating base 11 toward the open surface.

After locking, the switching spring 25 is biased by the spring biasing force so as to return to its free end length. Due to this biasing force, for example, as shown in FIG.
8 is strongly pressed against the first fixed contact 14, and the switching portion 21-1 of the switching piece 17 is strongly pressed against the first stopper 26 formed on the side wall of the insulating base 11. ing.

First and second extraction terminals 14-t and 15-t connected to the first and second fixed contacts 14 and 15,
It is led out of the insulating base 11. Also, switch axis 1
A third take-out terminal 13-t connected to the insulating base 11 is led out from the insulating base 11.

Therefore, in this first stable bias position of the switching spring 25, the first and third extraction terminals 14-t, 13
-t is electrically connected. In this state, the switching spring 25 is in a stable state, and this switching state is stably maintained.

When the operating shaft (not shown) is operated, the end of the operating shaft engages with the locking portion 22 and rotates the switching piece 17 in a direction that separates the switching portion 21-1 from the first stopper 26. When the switching piece 17 rotates and exceeds the neutral position, the switching spring 25 is reversed, and the switching part 21-2 of the switching piece 17 is strongly pressed against the second stopper 27 formed on the side wall of the insulating base 11. Being pushed. At the same time, the other side edge of the narrow portion 18 of the movable contact 16 is strongly pressed against the second fixed contact 15.

In this state, the switching spring 25 is in the second stable bias position, and the second and third extraction terminals 15-t, 13
-t is electrically connected. In this state, the switching spring 25 is in a stable state, and this switching state is stably maintained. In this way, the switching operation of the switch is performed by the reversing operation of the switching spring 25.

``Problems to be solved by the invention'' In conventional rotary switches, the first and second contacts formed on the movable contact 16 and the switching piece 17 are held in a state in which the switching spring 25 is held against the biasing force of the spring. It is necessary to insert them into the second locking holes 9 and 23, respectively, and the locking operation is quite difficult.

This idea was made in view of the current state of conventional rotary switches, and its purpose is to provide a rotary switch that is easy to manufacture and assemble, and that performs reliable switching operations. be.

"Structure of the invention" In this invention, a switch shaft and first and second fixed contacts are provided protruding from the bottom plate of the insulating base. A movable contact and a switching piece are rotatably mounted on the switch shaft, and the movable contact is rotatable between the first and second fixed contacts. First and second locking holes are formed in the movable contact and the switching piece, respectively, and these first and second locking holes are located on different radii with respect to the switch axis. 2
Both ends of the switching spring are respectively locked in the locking holes,
As the switching operation of the operator is performed, the switching piece rotates and the switching spring is reversed, and this reversal causes the movable contact and the first
The connection between the second fixed contact and the second fixed contact is switched.

In such a rotary switch, in this invention, a first stopper is formed on the bottom plate near the switch shaft and on the first fixed contact side of the switch shaft. Further, a second stopper, which is separate from the insulating base, is fixedly positioned with respect to the insulating base in the vicinity of the switch shaft and on the second fixed contact side of the switch shaft. When the switching piece is in biased contact with the first stopper due to the switching spring, the movable contact is in pressure contact with the second fixed contact, and when the switching piece is biased in contact with the second stopper due to the switching spring. The movable contact is brought into pressure contact with the first fixed contact. Furthermore, with the second stopper removed, the movable contact is brought into contact with the first fixed contact, and the switching piece is rotated beyond the position of the second stopper, and the first and second engagements are It is possible for the distance between the stop holes to be approximately equal to the distance between the free ends of the switching spring.

In the rotary switch of this invention, the distance between the first and second locking holes is adjusted by rotating the movable contact and the switching piece before the second stopper is attached.
It is possible to easily insert both ends of the switching spring into the first and second locking holes so that the distance between the free ends of the switching spring is approximately equal to the distance between the free ends of the switching spring. Thereafter, the spring can be reversed and the second stopper can be attached as a separate piece, making it easier to attach the switching piece and the switching spring.

Therefore, it is possible to provide a rotary switch with a simple manufacturing and assembly process with high production efficiency.

``Embodiments of the invention'' Hereinafter, the rotary switch of this invention will be explained in detail based on the embodiments using the drawings.

FIG. 1 shows the structure of an embodiment of the rotary switch of this invention, in which the switch shaft 13 and the first and second fixed contacts 14, 15 are integrally formed on a common piece. . That is, as shown in FIG. 4A, the first piece 31 and the second piece
Piece 32 and third piece 33 are integrally molded. Third
The piece 33 is connected to the adjacent first piece by a connecting piece 34.

Parts of the first piece 31 and the third piece 33 are cut and raised to form the first and second fixed contacts 14 and 15, respectively.
is formed. Further, a switch shaft 13 is formed on the second piece 32 to protrude in the same direction as the first and second fixed contacts 14 and 15.

The first piece 3 integrally formed with the common piece 30
1. The insulating base 11 is formed on the second piece 32 and the third piece 33 by outsert molding of a synthetic resin material. As shown in FIG. 5, an opening 35 is formed approximately in the center of the bottom plate 12 of the insulating substrate 11, and the bottom plate 12 has an opening 35 formed therein.
Three connecting holes 36 are formed at each corner of 2 through the side wall.

The first piece 31, the second piece 32, and the third piece 33 are embedded in the bottom plate 12 of the insulating base 11, and the first and second fixed contacts 14, 15 and the switch shaft 13 are embedded in the bottom plate 12 of the insulating base 11.
It is arranged to protrude from 2. A first stopper 45 is attached to the bottom plate 12 near the switch shaft 13 and on the first fixed contact 14 side of the switch shaft 13.
It is formed in a plane perpendicular to 2.

A movable contact and a switching piece are rotatably mounted on the switch shaft 13. The movable contact 10 is made of a metal material and is formed into an almost dogleg shape as shown in FIG. 38 is formed.

As shown in FIG. 7, the switching piece 39 is formed of a synthetic resin material into a substantially fan shape, and an engagement hole 40 is formed in the main part of the fan. Further, the peripheral edge facing the engagement hole 40 is cut in the direction of the engagement hole 40, and the cut 41
is formed. One side of the switching piece 39 sandwiching the notch 41 is formed thinly, and a second locking hole 42 is formed in this thinly formed portion.

As shown in FIG. 8, the switching spring 46, which is locked between the first and second locking holes 38, 42, has a piano wire wound around the center a predetermined number of times, and both ends of the wire are wound on the winding surface. They have shapes drawn approximately parallel to each other on parallel surfaces. The switching spring 46 having such a shape is configured to generate a large spring biasing force when an external force is applied in a direction to narrow the distance l ₀ between the free ends of the spring.

The engagement hole 37 of the movable contact 10 is inserted into the switch shaft 13, and the engagement hole 40 of the switching piece 39 is inserted into the switch shaft 13 from above the movable contact 10. A retainer 50 is attached to the switch shaft 13 to prevent the movable contact 10 and the switching piece 39 from coming off.

As shown in FIG. 9, the movable contact 10 is brought into contact with the first fixed contact 14, and the switching piece 39 is connected to the
3, the bottom plate 12 is rotated to the other side with respect to the switch shaft 13. This rotation is controlled by a second stopper 55 (Fig. 11,
This is done beyond the position shown in Figure 2). In the example, the ninth
As shown in the figure, the switching piece is rotated to a position where it comes into contact with the insulating base 11 at the side edge. In this rotational position, the distance between the first and second locking holes 38, 42 is set to be approximately equal to the distance l ₀ between the free ends of the switching spring 46.

Both ends of the switching spring 46 are inserted into the first and second locking holes 38 and 42, respectively. In this state, since the distance between the first and second locking holes 38 and 42 is set to be approximately equal to the distance l ₀ between the free ends of the switching spring 46, the switching spring 46
It is easily inserted between the locking holes 38 and 42 of.

As shown in FIG. 15, if the axis of the switch shaft 13 is O, the center of the second locking hole of the switching piece 39 is B, and the center of the first locking hole of the movable contact 10 is A, then
At this rotational position, the following equation holds true.

≒l ₀ ...(1) From this state, turn the switching piece 39 by a small angle in the direction of the arrow θ in Fig. 15, and when B becomes the B ₁ position,
The following formula holds true.

= ₁ ...(2) > ₁ ...(3) Therefore, when the switching piece 39 is rotated from the initial state so as to come into contact with the first stopper 45, the first and second locking holes 38, 42 is shorter than the distance l ₀ between the free ends of the switching spring 46. For this purpose, the strong biasing force of the switching spring 46 causes the movable contact 10 to
is held strongly pressed against the first fixed contact 14 and the switching piece 39 against a second stopper 55, which will be described later. When the switching piece 39 is further rotated toward the first stopper 45, the switching spring 46 is reversed, and the switching piece 39 is strongly pressed against the first stopper 45 as shown in FIG.
is in a state where it is strongly pressed against the second fixed contact 15.

From this state, a second stopper 55 is separately attached to a side edge portion located symmetrically to the first stopper 45 with the switch shaft 13 in between.

In the embodiment, a second stopper 55 is formed integrally with the lid that is fitted onto the insulating base 11. As shown in FIG. 12, the lid body 51 is made of, for example, a synthetic resin material and is formed into a substantially cylindrical shape with one side open, and an opening 53 is formed approximately in the center of the top plate 52 thereof. A side wall portion is formed at the peripheral edge of the upper plate 52, and an engagement shaft 54 is formed at one corner of the upper plate 52 so as to protrude from the side wall portion.

A plate-shaped second stopper 55 is integrally formed inside the side wall portion, protruding from the upper plate 52 at a corner position diagonally opposite to the corner where the engagement shaft 54 is formed. At the other corner of the upper plate 52,
Connection holes 56 are formed through the side walls. Furthermore, a fitting hole 57 is formed approximately at the center of the side wall portion where the second stopper 55 is formed.

As shown in FIG. 11, the movable contact 10 and the switching piece 39 are inserted into the switch shaft 13, and the switching spring 46 is attached between the first and second locking holes 38 and 42, and then the switching spring 46 is reversed. With the
That is, with the switching piece 39 in pressure contact with the first stopper 45 and the movable contact 10 in pressure contact with the second fixed contact 15, the operator 60 is placed at the position of the opening 35 (FIG. 1) in the insulating base 11. Set up

The operator 60 has a shape as shown in FIGS. 13A and 13B and is made of, for example, a synthetic resin material, and a portion of its peripheral surface protrudes in the radial direction to form an engaging portion 61. A pair of recesses 62 and 63 are formed around the center of one end surface of the operator 60. This operator 60
The operating shaft 65 for performing the rotation switching operation is made of, for example, a synthetic resin material and has a shape as shown in FIG.
It is attached to the operator 60 by fitting the convex portions 66, 67 formed protruding from the ends thereof into the recesses 62, 63 of the operator 60.

In this way, the operating shaft 65 attached to the operating element 60 is made to protrude from the opening 53 of the lid 51 (FIG. 12), and the opening surface of the insulating base 11 is covered from the state shown in FIG. Lid body 51
is assembled to the insulating base 11.

With this assembly, the engagement shaft 54 of the lid body 51
is inserted into the connecting hole 36 of the insulating base 11, and the switch shaft 13 is positioned in the fitting hole 57 of the lid 51.
Furthermore, by assembling the lid 51 to the insulating base 11, the second stopper 55 is disposed on the side edge at a position symmetrical to the first stopper 45 with the switch shaft 13 in between, as shown by the dotted line in FIG. be done. The lid body 51 is fixed to the insulating base 11 by any means, and the protruding portions of the first piece 31, the second piece 32, and the third piece 33 from the insulating base 11 are connected to the lead terminals 14-t,
13-t and 15-t are cut to a predetermined length.

When the operation shaft 65 is rotated, the operator 60 fitted to the operation shaft 65 is rotated within the insulating base 11 . This rotation of the operator 60 causes the engaging portion 61 to engage with the notch 41, so that the switching piece 39 can be rotated.

For example, from the state shown in FIG.
When the operator 60 is rotated in the direction of the arrow θ, the end face of the engaging portion 61 engages with the notch 41, and the switching piece 39 is rotated in the direction away from the first stopper 46. Due to this rotation, the switching spring 46 is reversed and a strong biasing force is generated on the switching spring 46, and the switching piece 3
9 is strongly abutted against the second stopper 55. At the same time, the movable contact 10 that had been pressed against the second fixed contact 15 separates from the second fixed contact 15, and
The fixed contact 14 is strongly contacted.

For this reason, the electrical connection between the extraction terminals 13-t and 15-t is
The electrical connection between the two is switched, and the switch is switched.

By setting the distance between the first and second locking holes 38 and 42 formed in the movable contact 10 and the switching piece 39, respectively, to be approximately equal to the distance between the free ends of the switching spring 46, the switching spring 46 is set at the free end. While keeping it long, connect both ends of the first and second ends from the open surface side of the insulating base 11.
can be inserted into the locking holes 38 and 42 of the
Assembly work is easily performed. Further, during this assembly work, since the second stopper 55 is not attached within the insulating base 11, parts can be easily inserted and work efficiency is improved. Since the switching spring 46 does not need to be narrowed and inserted and can be inserted with its free end length unchanged, the switching spring 46 will not fly off during assembly work, and the assembly work can be performed extremely efficiently.

In the embodiment, the second stopper 5 is integrated with the lid body 51.
Although the stopper 55 is not necessarily formed on the lid 51, the stopper 55 is not necessarily formed on the lid 51. For example, only the stopper 55 is connected to the insulating base 1
It is also possible to realize a configuration in which the insulating base 11 can be fitted and attached to the insulating base 11 and one side of the insulating base 11 is an open surface.

This type of rotary switch can be used not only when used alone, but also when installed at the end of a variable resistor, when installed between two variable resistors, and when used as a variable resistor. Various configurations can be realized, such as when the device is used by being incorporated between the device and other electrical components such as a push switch.

Further, in the embodiment, a single-pole double-throw switch having a pair of fixed contacts has been described, but this invention can also be applied to a single-pole, single-throw switch.

``Structure of the invention'' As explained in detail above, according to this invention, it is possible to provide a rotary switch that is easy to manufacture and assemble, has high production efficiency, and is capable of performing highly accurate switching operations. .

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing the configuration of an embodiment of this invention, FIG. 2 is a partially cutaway perspective view showing the structure of a conventionally used rotary switch, and FIG. 3 is a partially cutaway perspective view showing the structure of a conventionally used rotary switch. Figures 4A and 4B are diagrams showing the shape of the switching spring used in the rotary switch described above, and Figures 4A and 4B are diagrams showing the process of creating the switch shaft and the first and second fixed contacts in the embodiment of this invention. , A is a plan view, B is a front view, and FIG. 5 is a diagram showing the switch axis and the first and second
Fig. 6 is a plan view showing the attached state of the fixed contact, Fig. 6 is a view showing the shape of the movable contact used in the embodiment of this invention, and Fig. 7 shows the shape of the switching piece used in the embodiment of this invention. 8 are plan views showing the shape of the switching spring used in the embodiment of this invention,
FIG. 9 is a plan view showing a switching piece, a variable contact, and a switching spring attached to an insulating base in an embodiment of this invention, and FIG. FIG. 11 is a plan view showing a state in which the bridge, movable contact, and switching spring are attached, the switching bridge is in pressure contact with the first stopper, and the movable contact is in pressure contact with the second fixed contact. A plan view showing a state in which a switching piece, a movable contact, a switching spring, and an operator are attached to the 12th
Figures A and B are a plan view and a front view, respectively, showing the configuration of the lid body used in the embodiment of this invention, and Figures 13A and B are each showing the configuration of the operator used in the embodiment of this invention. A plan view and a BB sectional view of A, FIGS. 14A and 14B are a plan view and a front view, respectively, showing the configuration of the operating shaft used in an embodiment of this invention, and FIG. 15 is a diagram of an embodiment of this invention. It is a diagram of the principle of operation. 10...Movable contact, 11...Insulating base, 12...
... Bottom plate, 13 ... Switch shaft, 14 ... First fixed contact, 15 ... Second fixed contact, 30 ... Common piece, 31 ... First piece, 32 ... Second piece, 33 ...
Third piece, 35...opening hole, 36...connecting hole, 37...
...Engagement hole, 38...First locking hole, 39...Switching piece, 40...Engagement hole, 41...Notch, 42...
Second locking hole, 45... First stopper, 46...
... Switching spring, 50 ... Stopper, 51 ... Lid, 52 ... Upper plate, 53 ... Opening hole, 54 ... Engagement shaft, 55 ... Second stopper, 56 ... Connection hole,
57... Fitting hole, 60... Operator, 61... Engaging portion, 62, 63... Recess, 65... Operating shaft, 6
6, 67...Protrusion.

Claims (1)

[Scope of claim for utility model registration] The switch shaft and the first
and a second fixed contact, and a movable contact and a switching piece are rotatably mounted on the switch shaft,
The movable contact is rotatable between the first and second fixed contacts, first and second locking holes are formed in the movable contact and the switching piece, respectively, and the first and second locking holes are formed in the movable contact and the switching piece, respectively.
The locking holes are located on different radii with respect to the switch shaft, and both ends of the switching spring are respectively locked in the first and second locking holes, and the switching piece is switched by the switching operation of the operator. is rotated to reverse the switching spring, and this reversal switches the connection between the movable contact and the first and second fixed contacts; On the first fixed contact side of the switch shaft, a first
a stopper is formed, and a second stopper separate from the insulating base is fixedly positioned with respect to the insulating base near the switch shaft and on the second fixed contact side of the switch shaft, When the switching piece is biased against the first stopper by the switching spring, the movable contact is pressed against the second fixed contact, and the switching piece is biased against the second stopper by the switching spring. In the opposed state, the movable contact is in pressure contact with the first fixed contact, and with the second stopper removed, the movable contact is brought into contact with the first fixed contact, and the switching piece is moved. When the switch is rotated beyond the position of the second stopper, the distance between the first and second locking holes can be made approximately equal to the distance between the free ends of the switching spring. A rotary switch characterized by: